diff --git a/nicsensor.sh b/nicsensor.sh
index ac954c6..9bd4766 100755
--- a/nicsensor.sh
+++ b/nicsensor.sh
@@ -218,7 +218,7 @@ format_log_print(){
 # @Param4 pca9548 channel 
 # @Param5 pcie slot number
 do_i2c_detect(){
-    if [ $nic_type == "ocp" ];then
+    if [ $nic_type = "ocp" ];then
         format_print $INFO "OCP slot $5 : bus$1 9548channel$4"
     else
         format_print $INFO "PCIe slot $5 : bus$1 9548channel$4"
@@ -237,7 +237,7 @@ reset_pca9548(){
 set_configuration_5280m7(){
 
     # set pca9641 address && I2C BUS
-    if [ $nic_type == "ocp" ];then
+    if [ $nic_type = "ocp" ];then
         is_have_pca9641=0
         pca9548_slave="0x70"
         i2c_bus=3
@@ -255,7 +255,7 @@ set_configuration_5280m7(){
     fi
 
     # set pca9548 switch channel
-    if [ $nic_type == "ocp" ];then
+    if [ $nic_type = "ocp" ];then
         if [ $slot_number -eq 0 ];then
             pca9548_channel="0x01"
         elif [ $slot_number -eq 1 ];then
@@ -285,7 +285,7 @@ set_configuration_5280m7(){
 }
 
 set_configuration_5468m7(){
-    if [ $nic_type == "ocp" ];then
+    if [ $nic_type = "ocp" ];then
         format_print $ERROR "Unsupport OCP Nic on $server_type"
         format_print $INFO "Please check if script has update version"
         exit 1
@@ -333,7 +333,7 @@ set_configuration_5468m7(){
 }
 
 set_configuration_donghu(){
-    if [ $nic_type == "ocp" ];then
+    if [ $nic_type = "ocp" ];then
         format_print $ERROR "Unsupport OCP Nic on $server_type"
         format_print $INFO "Please check if script has update version"
         exit 1
@@ -367,7 +367,7 @@ set_configuration_donghu(){
 }
 
 set_configuration_yichun(){
-    if [ $nic_type == "ocp" ];then
+    if [ $nic_type = "ocp" ];then
         format_print $ERROR "Unsupport OCP Nic on $server_type"
         format_print $INFO "Please check if script has update version"
         exit 1
@@ -392,7 +392,7 @@ set_configuration_yichun(){
 }
 
 set_configuration_qiandaohu(){
-    if [ $nic_type == "ocp" ];then
+    if [ $nic_type = "ocp" ];then
         format_print $ERROR "Unsupport OCP Nic on $server_type"
         format_print $INFO "Please check if script has update version"
         exit 1
@@ -439,7 +439,7 @@ set_configuration_qiandaohu(){
 }
 
 set_configuration_5688m7(){
-    if [ $nic_type == "ocp" ];then
+    if [ $nic_type = "ocp" ];then
         format_print $ERROR "Unsupport OCP Nic on $server_type"
         format_print $INFO "Please check if script has update version"
         exit 1
@@ -494,7 +494,7 @@ parse_nic_slot(){
             ;;
     esac
 
-    if [ $nic_type == "ocp" ];then
+    if [ $nic_type = "ocp" ];then
         slot_number=$(echo $nic_slot | cut -c 4)
     else
         if [ $fullname -eq 1 ];then
@@ -554,9 +554,9 @@ init_debuglog(){
     format_log_print $INFO "Debug Mode : $DEBUG_MODE"
     format_log_print $INFO "Disable Detect : $DISABLE_DETECT"
 
-    if [ "$nic_slot" == "detect" ];then
+    if [ "$nic_slot" = "detect" ];then
         format_log_print $INFO "Operation Tpye : i2c detect"
-    elif [ "$nic_slot" == "version" ];then
+    elif [ "$nic_slot" = "version" ];then
         format_log_print $INFO "Operation Tpye : get version"
     else
         format_log_print $INFO "Operation Tpye : read sensor"
@@ -619,7 +619,7 @@ pre_exec_hook(){
     init_debuglog
 
     # is param legel?
-    if [ "$sensor_type" == "chip" ];then
+    if [ "$sensor_type" = "chip" ];then
         if [ $param_num -le 3 ];then
             format_print $ERROR "Command Format illegal"
             print_chip_command_format
@@ -628,12 +628,12 @@ pre_exec_hook(){
     fi
 
     # if the action is fru write, need pre-process fru data
-    if [ "$sensor_type" == "fru" ];then
-        if [ "$option_data" == "write" ];then
+    if [ "$sensor_type" = "fru" ];then
+        if [ "$option_data" = "write" ];then
             format_log_print $INFO "Opreation FRU Write"
             
             # is option_data(fru file name) valid?
-            if [ "$option_data2" == "" ];then
+            if [ "$option_data2" = "" ];then
                 format_print $ERROR "Please provide fru file name"
                 print_fru_command_format
                 exit 1
@@ -1210,7 +1210,7 @@ process_fru(){
     # fru no need to init first
 
     # write and read fru
-    if [ "$option_data" == "write" ];then
+    if [ "$option_data" = "write" ];then
         write_fru
     else
         # default action is read
@@ -1270,7 +1270,7 @@ start_get_sensor(){
 }
 
 detect_on_5280m7(){
-    if [ $nic_type == "ocp" ];then
+    if [ $nic_type = "ocp" ];then
         i2c_bus=3
         do_i2c_detect $i2c_bus 0x70 0x01 0 0
         do_i2c_detect $i2c_bus 0x70 0x02 1 1
@@ -1298,7 +1298,7 @@ detect_on_5280m7(){
 }
 
 detect_on_5468m7(){
-    if [ $nic_type == "ocp" ];then
+    if [ $nic_type = "ocp" ];then
         format_print $ERROR "Unsupport OCP Nic on $server_type"
         format_print $INFO "Please check if script has update version"
         exit 1
@@ -1329,7 +1329,7 @@ detect_on_5468m7(){
 }
 
 detect_on_donghu(){
-    if [ $nic_type == "ocp" ];then
+    if [ $nic_type = "ocp" ];then
         format_print $ERROR "Unsupport OCP Nic on $server_type"
         format_print $INFO "Please check if script has update version"
         exit 1
@@ -1348,7 +1348,7 @@ detect_on_donghu(){
 }
 
 detect_on_yichun(){
-    if [ $nic_type == "ocp" ];then
+    if [ $nic_type = "ocp" ];then
         format_print $ERROR "Unsupport OCP Nic on $server_type"
         format_print $INFO "Please check if script has update version"
         exit 1
@@ -1368,7 +1368,7 @@ detect_on_yichun(){
 }
 
 detect_on_qiandaohu(){
-    if [ $nic_type == "ocp" ];then
+    if [ $nic_type = "ocp" ];then
         format_print $ERROR "Unsupport OCP Nic on $server_type"
         format_print $INFO "Please check if script has update version"
         exit 1
@@ -1394,7 +1394,7 @@ detect_on_qiandaohu(){
 }
 
 detect_on_5688m7(){
-    if [ $nic_type == "ocp" ];then
+    if [ $nic_type = "ocp" ];then
         format_print $ERROR "Unsupport OCP Nic on $server_type"
         format_print $INFO "Please check if script has update version"
         exit 1
@@ -1467,17 +1467,17 @@ start_detect_device(){
 
 pre_exec_hook
 
-if [ "$1" == "version" ];then
+if [ "$1" = "version" ];then
     echo "Script Version : $SCRIPT_VERSION"
     echo "Debug Mode     : $DEBUG_MODE"
     echo "Disable Detect : $DISABLE_DETECT"
     exit 0
 fi
 
-if [ "$1" == "detect" ];then
-    if [ "$2" == "ocp" ];then
+if [ "$1" = "detect" ];then
+    if [ "$2" = "ocp" ];then
         nic_type="ocp"
-    elif [ "$2" == "pcie" ];then
+    elif [ "$2" = "pcie" ];then
         nic_type="pcie"
     else
         format_print $WARNING "Please provide valid nic type, default to pcie"